<template>
  	<section>
    	<header class="top_tips"> <!-- 头部 通过 v-if fatherComponent 判断 是主页 还是 做题页 显示不同的页面效果 -->
    		<span class="num_tip" v-if="fatherComponent == 'home'">{{level}}</span>
    		<span class="num_tip" v-if="fatherComponent == 'item'">题目{{itemNum}}</span>
    	</header>
    	<div v-if="fatherComponent == 'home'" >
    		<div class="home_logo item_container_style"></div>
    		<router-link to="item" class="start button_style" ></router-link>
    	</div>
    	<div v-if="fatherComponent == 'item'" >
    		<div class="item_back item_container_style">
    			<div class="item_list_container" v-if="itemDetail.length > 0">
    				<header class="item_title">{{itemDetail[itemNum-1].topic_name}}</header>
    				<ul>
    					<li  v-for="(item, index) in itemDetail[itemNum-1].topic_answer" @click="choosed(index, item.topic_answer_id)" :key="index" class="item_list">
    						<span class="option_style" v-bind:class="{'has_choosed':choosedNum==index}">{{chooseType(index)}}</span>
    						<span class="option_detail">{{item.answer_name}}</span>
    					</li>
    				</ul>
    			</div>
    		</div>
    		<span class="next_item button_style" @click="nextItem" v-if="itemNum < itemDetail.length"></span>
    		<span class="submit_item button_style" v-else @click="submitAnswer"></span>
    	</div>
  	</section>
</template>

<script>
import { mapState, mapActions } from "vuex";
export default {
  name: "itemcontainer",
  data() {
    return {
      itemId: null, //题目ID
      choosedNum: null, //选中答案索引
      choosedId: null //选中答案id
    };
  },
  props: ["fatherComponent"],
  computed: mapState([
    "itemNum", //第几题
    "level", //第几周
    "itemDetail", //题目详情
    "timer" //计时器
  ]),
  methods: {
    ...mapActions(["addNum", "initializeData"]),
    //点击下一题
    nextItem() {
      if (this.choosedNum !== null) {
        this.choosedNum = null;
        //保存答案, 题目索引加一，跳到下一题
        this.addNum(this.choosedId);
      } else {
        alert("您还没有选择答案哦");
      }
    },
    //索引0-3对应答案A-B
    chooseType: type => {
      switch (type) {
        case 0:
          return "A";
        case 1:
          return "B";
        case 2:
          return "C";
        case 3:
          return "D";
      }
    },
    //选中的答案信息
    choosed(type, id) {
      this.choosedNum = type;
      this.choosedId = id;
    },
    //到达最后一题，交卷，请空定时器，跳转分数页面
    submitAnswer() {
      if (this.choosedNum !== null) {
        this.addNum(this.choosedId);
        clearInterval(this.timer);
        this.$router.push("score");
      } else {
        alert("您还没有选择答案哦");
      }
    }
  },
  created() {
    //初始化信息
    if (this.fatherComponent == "home") {
      this.initializeData();
      document.body.style.backgroundImage = "url(./static/img/1-1.jpg)";
    }
  }
};
</script>

<style lang="less">
.top_tips {
  position: absolute;
  height: 7.35rem;
  width: 3.25rem;
  top: -1.3rem;
  right: 1.6rem;
  background: url(../images/WechatIMG2.png) no-repeat;
  background-size: 100% 100%;
  z-index: 10;
  .num_tip {
    position: absolute;
    left: 0.48rem;
    bottom: 1.1rem;
    height: 0.7rem;
    width: 2.5rem;
    font-size: 0.6rem;
    font-family: "黑体";
    font-weight: 600;
    color: #a57c50;
    text-align: center;
  }
}
.item_container_style {
  height: 11.625rem;
  width: 13.15rem;
  background-repeat: no-repeat;
  position: absolute;
  top: 4.1rem;
  left: 1rem;
}
.home_logo {
  background-image: url(../images/1-2.png);
  background-size: 13.142rem 100%;
  background-position: right center;
}
.item_back {
  background-image: url(../images/2-1.png);
  background-size: 100% 100%;
}
.button_style {
  display: block;
  height: 2.1rem;
  width: 4.35rem;
  background-size: 100% 100%;
  position: absolute;
  top: 16.5rem;
  left: 50%;
  margin-left: -2.4rem;
  background-repeat: no-repeat;
}
.start {
  background-image: url(../images/1-4.png);
}
.next_item {
  background-image: url(../images/2-2.png);
}
.submit_item {
  background-image: url(../images/3-1.png);
}
.item_list_container {
  position: absolute;
  height: 7rem;
  width: 8rem;
  top: 2.4rem;
  left: 3rem;
  -webkit-font-smoothing: antialiased;
}
.item_title {
  font-size: 0.65rem;
  color: #fff;
  line-height: 0.7rem;
}
.item_list {
  font-size: 0;
  margin-top: 0.4rem;
  width: 10rem;
  span {
    display: inline-block;
    font-size: 0.6rem;
    color: #fff;
    vertical-align: middle;
  }
  .option_style {
    height: 0.725rem;
    width: 0.725rem;
    border: 1px solid #fff;
    border-radius: 50%;
    line-height: 0.725rem;
    text-align: center;
    margin-right: 0.3rem;
    font-size: 0.5rem;
    font-family: "Arial";
  }
  .has_choosed {
    background-color: #ffd400;
    color: #575757;
    border-color: #ffd400;
  }
  .option_detail {
    width: 7.5rem;
    padding-top: 0.11rem;
  }
}
</style>
